To achieve the objectives of teaching and learning ‘scale drawing’ topic in KCSE
mathematics syllabus (KIE, 2002), teachers in the experimental schools were expected to
follow a guideline provided by the researchers, which was aimed at ensuring uniformity of
treatment. The control Groups (C1 & C2) were taught through the conventional teaching
methods. The topic was taught at the same time to all the groups to ensure uniformity and
comparability of results.